The spectroscopic orbit and the geometry of R Aqr

Details The spectroscopic orbit and the geometry of R Aqr The spectroscopic orbit and the geometry of R Aqr

2008-04-25

arxiv.org/abs/0804.4139v4

Astronomy and Astrophysics

Astrophysics

7 pages, 4 figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:200810052

R Aqr is one of the closest symbiotic binaries and the only D-type system with radial velocity data suitable for orbital parameters estimation. The aims of our study are to derive a reliable spectroscopic orbit of the Mira component, and to establish connections between the orbital motion and other phenomena shown by R Aqr. We reanalize velocity data recently published by McIntosh & Rustan complemented by additional velocities. We find an eccentric orbit (e=0.25) with a period 43.6 yr. This solution is in agreement with a resolved VLA observation of this system. We demonstrate that the last 1974-1981 increase of extinction towards the Mira occured during its superior spectroscopic conjunction, and can be due to obscuration by a neutral material in the accreting stream. We also show that jet ejection is not connected with the orbital position.

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